{
  "manageEntity": {
    "action": "Save",
    "entityId": "321523029",
    "entityType": "Track",
    "nonce": "0x5c1041fc4c9b31bf4d4427c9fbd10de5779aae02988d2513b375c14377b6c3d9",
    "signature": "0x7c3ca4ce2d5f53b773e2a92495c06f27547b204c8d4c1c1677e88b62f76c1f906cd8bee68f86f14cb557e0635c6bee5402732507341dce248b6f9a156f8746861b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}